oj.uz

답안 #823875

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
823875 2023-08-13T09:15:13 Z Sandarach151 Lutrija (COCI19_lutrija) C++17
0 / 70
 1 ms 212 KB 
#include<bits/stdc++.h>
using namespace std;

long long M;
long long qexp (long long b, long long e) { //quick exponentiation (see below)
    if (e == 0) return 1;
    if (e == 1) return b%M;
    long long h = qexp(b, e/2);
    h *= h;
    h %= M;
    if (e%2 == 0) return h;
    return (h*b)%M;
}
bool isPrime(long long N) {
    if (N <= 1) return 0;
    if (N <= 3) return 1;
    if (N == 4) return 0;
    long long s = (N-1)&(1-N), d = (N-1)/s;
    M = N;
    for (long long i = 0, K = 100; i < K; ++i) {
        long long witness = rand()%(N-4) + 2;  //generate random witness between [2, N-2]
        long long a = qexp(witness, d);
        if (a == 1 || a == N-1) continue;
        bool pass = 1;
        for (long long k = 1; k < s && pass; k<<=1) {
            a*=a;
            a%=N;
            if (a == N-1) pass = false;
        }
        if (pass) return 0; /* not a prime due to witness */
    }
    return 1;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    long long a, b;
    vector<long long> vect;
    cin >> a >> b;
    bool swapped = false;
    if(a==2){
        swap(a, b);
        swapped = true;
    }
    long long tempa = a;
    bool res1 = true;
    while(!isPrime(abs(b-a))){
        a+=2;
        if(!isPrime(a)){
            res1 = false;
            break;
        }
    }
    a = tempa;
    bool res2 = true;
    while(!isPrime(abs(b-a))){
        a-=2;
        if(!isPrime(a)){
            res2 = false;
            break;
        }
    }
    if(!res1 && !res2){
        cout << -1 << '\n';
    }
    else{
		if(res1){
			a = tempa;
			vect.push_back(a);
			while(!isPrime(abs(b-a))){
				a+=2;
				vect.push_back(a);
			}
			vect.push_back(b);
		}
		if(res2 && vect.size()>30){
            vect.clear();
			a = tempa;
			vect.push_back(a);
			while(!isPrime(abs(b-a))){
				a-=2;
				vect.push_back(a);
			}
			vect.push_back(b);
		}
		if(!swapped){
			cout << vect.size() << '\n';
			for(long long i=0; i<vect.size(); i++){
				cout << vect[i] << ' ';
			}
		}
		else{
			cout << vect.size() << '\n';
			for(long long i=vect.size()-1; i>=0; i--){
				cout << vect[i] << ' ';
			}
		}
	}
    return 0;
}

Compilation message

lutrija.cpp: In function 'int main()':
lutrija.cpp:89:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |    for(long long i=0; i<vect.size(); i++){
      |                       ~^~~~~~~~~~~~

Subtask #1
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 0 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 0 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -